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  • 1
    Language: English
    In: Water, Air, and Soil Pollution, 2010, Vol.205(1), pp.93-105
    Description: As floodplain soils are often contaminated, we studied the release of trace metals from three topsoil horizons in column experiments with variable flow interruptions and flow velocities, compared it with that in batch leaching tests and evaluated the column data by inverse simulations. Only small proportions (〈1%) of trace metals present in the neutral and humic soils were mobilised by the batch leaching tests and the column experiments. Release of Cr, Cu, Ni and Zn in the column experiments was rate-limited, as detected by increased concentrations after flow interruptions. A combination of linear equilibrium and non-equilibrium isotherms reflected the Ni and Zn elution data, with Zn release being slower. Simulated values for initially bound metals available for release are in the same order of magnitude as those determined by the batch leaching tests. However, the consistency of both experimental approaches decreases with increasing rate limitation, as detected here for Zn.
    Keywords: Soil contamination ; Trace metals ; Column experiment ; Kinetics ; Wetland soils
    ISSN: 0049-6979
    E-ISSN: 1573-2932
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  • 2
    Language: English
    In: Journal of Colloid And Interface Science, Sept 1, 2013, Vol.405, p.44(7)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jcis.2013.05.041 Byline: Matthias Handel, Thilo Rennert, Kai U. Totsche Abstract: Display Omitted Article History: Received 20 February 2013; Accepted 17 May 2013
    Keywords: Oxides ; Manganese Compounds
    ISSN: 0021-9797
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Environmental Pollution, August, 2013, Vol.179, p.315(11)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.envpol.2013.03.041 Byline: Markus Wehrer, Thilo Rennert, Kai Uwe Totsche Abstract: Mass transfer processes of pollutants from non-aqueous phase liquids (NAPL) may control groundwater pollution at abandoned industrial sites. We studied release kinetics of polycyclic aromatic hydrocarbons (PAHs) from fresh and aged tar phases using a dialysis tubing technique. Time for equilibration ranged from several days to more than three years. For fresh tar materials the release seems to be limited by retarded pore diffusion, while for two of three aged tars diffusion limited release influenced by dissolved organic matter (DOM) was assumed. The equilibration process was driven by solubilization thermodynamics expressed by Raoult's law. Yet, solubility enhancement was observed potentially due to the presence of organic mobile sorbents. The results show that the release of PAHs from tar phases is generally rate limited and partitioning according to Raoult's law is the driving mechanism of the exchanges process. Author Affiliation: (a) Institute of Geosciences, Friedrich Schiller University of Jena, Burgweg 11, 07743 Jena, Germany (b) Department of Earth and Environmental Sciences, Rutgers, The State University of New Jersey, Smith Hall Room 136, 101 Warren Street, Newark, NJ 07102, United States Article History: Received 31 October 2012; Revised 13 March 2013; Accepted 19 March 2013
    Keywords: Water Pollution ; Thermodynamics ; Groundwater ; Polycyclic Aromatic Hydrocarbons ; Pollution Control
    ISSN: 0269-7491
    Source: Cengage Learning, Inc.
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  • 4
    Language: English
    In: Environmental pollution, 2011, Vol.159(5), pp.1398-1405
    Description: Arsenic mobility may increase in liquid phase due to association with colloidal Fe oxides. We studied the association of As with Fe oxide colloids in the effluent from water-saturated soil columns run under anoxic conditions. Upon exfiltration, the solutions, which contained Fe²⁺, were re-aerated and ferrihydrite colloids precipitated. The entire amount of effluent As was associated with the ferrihydrite colloids, although PO₄ ³⁻, SiO₄ ⁴⁻, CO₃ ²⁻ and dissolved organic matter were present in the effluent during ferrihydrite colloid formation. Furthermore, no subsequent release of As from the ferrihydrite colloids was observed despite the presence of these (in)organic species known to compete with As for adsorption on Fe oxides. Arsenic was bound via inner-sphere complexation on the ferrihydrite surface. FTIR spectroscopy also revealed adsorption of PO₄ ³⁻ and polymerized silica. However, these species could not impede the quantitative association of As with colloidal ferrihydrite in the soil effluents. ; p. 1398-1405.
    Keywords: Iron Oxides ; Dissolved Organic Matter ; Effluents ; Arsenic ; Adsorption ; Polymerization ; Anaerobic Conditions ; Ferrihydrite ; Iron ; Colloids ; Silica ; Fourier Transform Infrared Spectroscopy ; Soil
    ISSN: 0269-7491
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  • 5
    Language: English
    In: Water, Air, and Soil Pollution, 2010, Vol.206(1), pp.395-396
    Description: Byline: Thilo Rennert (1), Jorg Rinklebe (2) Author Affiliation: (1) Lehrstuhl Hydrogeologie, Institut fur Geowissenschaften, Friedrich-Schiller-Universitat Jena, Burgweg 11, 07749, Jena, Germany (2) Boden- und Grundwassermanagement, Fachbereich D, Bergische Universitat Wuppertal, Pauluskirchstr. 7, 42285, Wuppertal, Germany Article History: Registration Date: 26/05/2009 Online Date: 25/06/2009 Article note: The online version of the original article can be found under http://dx.doi.org/10.1007/s11270-009-0058-0.
    Keywords: Soils;
    ISSN: 0049-6979
    E-ISSN: 1573-2932
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  • 6
    Language: English
    In: Chemical Geology, Nov 25, 2012, Vol.332-333, p.116(8)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.chemgeo.2012.09.046 Byline: Thilo Rennert, Karin Eusterhues, Vincent De Andrade, Kai U. Totsche Keywords: Geogenic CO.sub.2; Soil formation; Fe speciation; Green rust; Organic complexation Abstract: Geogenic CO.sub.2, which ascends on so-called mofette sites, may affect development and properties of soils. Therefore, we studied soils on a mofette site in the Czech Republic at three spots differing in the partial pressures of soil CO.sub.2 (p(CO.sub.2)=0.04, 1, and 1). We recorded 69 Fe K-XANES spectra in 5 regions of interest on 3 thin sections in fluorescence mode. Iron was enriched in filled pores, e.g., former root channels. Generally, most of the Fe was identified in different clay minerals (smectites, illites and chlorites). Minor pedogenic Fe contributors were ferrihydrite, green rust, magnetite, maghemite, vivianite and siderite, whereas typical soil Fe (hydr)oxides such as goethite, hematite or lepidocrocite were never doubtlessly identified. The Fe(II)-containing minerals were particularly detected at p(CO.sub.2)=1 indicating an effect of soil CO.sub.2 on the formation of secondary Fe phases. Organic Fe complexes were less important, and their formation seemed to be inhibited at p(CO.sub.2)=1. We thus conclude that geogenic CO.sub.2 affects pedogenesis and causes quantitative and qualitative variations of Fe speciation. Article History: Received 11 July 2012; Revised 26 September 2012; Accepted 27 September 2012 Article Note: (miscellaneous) Editor: Dr. J. Fein
    Keywords: Iron (Metal) ; Smectite ; Iron Oxides ; Soils ; Chlorites (Minerals) ; Iron Ores
    ISSN: 0009-2541
    Source: Cengage Learning, Inc.
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  • 7
    Language: English
    In: Journal of Colloid And Interface Science, 01 September 2013, Vol.405, pp.44-50
    Description: Cryptomelane-type octahedral molecular sieves (K-OMS-2) were successfully synthesized at ambient pressure and temperature by a simple one-step reaction pathway. We designed three synthesis mixes based on redox reactions of either MnSO or MnCl together with KMnO in aqueous solution. The synthesis products were characterized structurally (XRD, FTIR spectroscopy), morphologically (SEM, BET surface area), and chemically (SEM-EDX, ICP-OES). For all mixes, a precursor octahedral layered K-birnessite (K-OL-1) was formed after 1 d that subsequently transformed into K-OMS-2. This transformation process depends on the pH of the reaction solution, the respective Mn(II) salt and time. We obtained K-OMS-2 materials with BET surface areas between 50.4 and 104.5 m g and different crystallinities. The described method is reliable, reproducible, easy to handle and may be the basis to produce well defined Mn oxides that could be used for remediation and catalysis purposes.
    Keywords: Octahedral Molecular Sieve ; K-Oms-2 ; K-Ol-1 ; Nanowires ; Mn Oxide ; Bet Surface ; Engineering ; Chemistry
    ISSN: 0021-9797
    E-ISSN: 1095-7103
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  • 8
    Language: English
    In: Journal of colloid and interface science, 2013, Vol.405, pp.44-50
    Description: Cryptomelane-type octahedral molecular sieves (K-OMS-2) were successfully synthesized at ambient pressure and temperature by a simple one-step reaction pathway. We designed three synthesis mixes based on redox reactions of either MnSO₄ or MnCl₂ together with KMnO₄ in aqueous solution. The synthesis products were characterized structurally (XRD, FTIR spectroscopy), morphologically (SEM, BET surface area), and chemically (SEM-EDX, ICP-OES). For all mixes, a precursor octahedral layered K-birnessite (K-OL-1) was formed after 1d that subsequently transformed into K-OMS-2. This transformation process depends on the pH of the reaction solution, the respective Mn(II) salt and time. We obtained K-OMS-2 materials with BET surface areas between 50.4 and 104.5m²g⁻¹ and different crystallinities. The described method is reliable, reproducible, easy to handle and may be the basis to produce well defined Mn oxides that could be used for remediation and catalysis purposes. ; p. 44-50.
    Keywords: Redox Reactions ; Potassium Permanganate ; Aqueous Solutions ; X-Ray Diffraction ; Manganese ; Temperature ; Remediation ; Manganese Oxides ; Catalytic Activity ; Scanning Electron Microscopy ; Ph ; Fourier Transform Infrared Spectroscopy ; Surface Area
    ISSN: 0021-9797
    Source: AGRIS (Food and Agriculture Organization of the United Nations)
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  • 9
    Language: English
    In: Soil Research, 2018, Vol.56(4), p.396-403
    Description: The presence of geogenic CO has been recently identified as a soil-forming factor in soil on mofette sites. Topsoil samples (with a maximum CO concentration of 52% at 10 cm depth) were studied along a transect on a mofette site in the NW Czech Republic to further understand the processes within soil and the soil properties induced by CO in the soil atmosphere. Geogenic CO negatively affected the cation exchange capacity, the ratio of exchangeable Ca and Mg, and the total contents of Al, Mg and Mn. No effect was detected on a chemical index of weathering and the mineralogical composition of the clay fractions, which might be explained by the acidic parent material and the progress of soil development. Diffuse reflectance infrared spectroscopy indicated that the composition of particulate soil organic matter was partially affected by CO concentrations: the higher the CO concentrations, the smaller the extent of oxidative transformation and the smaller the abundance of carboxyl groups. In the clay fractions, stabilisation of transformed soil organic matter (SOM) was promoted by exchangeable Al. This study quantifies, for the first time, the correlation between geogenic CO and several inorganic soil properties and the composition of SOM in physical fractions.
    Keywords: DRIFT spectroscopy; mofette; stabilisation; weathering.
    ISSN: 1838-675X
    E-ISSN: 1838-6768
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  • 10
    Language: English
    In: Soil Research, 2018, Vol.56(4), p.396
    ISSN: 1838-675X
    Source: CrossRef
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